Microwave-Assisted Solvent-Free Acetylation of Some Alcohols Catalyzed by Keggin-Type Heteropoly Acids

2011 ◽  
Vol 50 (4) ◽  
pp. 1837-1846 ◽  
Author(s):  
Esmail Rezaei-Seresht ◽  
Farokhzad Mohammadi Zonoz ◽  
Mahmoud Estiri ◽  
Reza Tayebee
Keyword(s):  
Solvent Free ◽  
Heteropoly Acids ◽  
Microwave Assisted ◽  
Keggin Type

Solvent-free and selective tosylation of alcohols and phenols with p-toluenesulfonyl chloride by heteropolyacids as highly efficient catalysts

2006 ◽  
Vol 84 (5) ◽  
pp. 812-818 ◽  
Author(s):  
Razieh Fazaeli ◽  
Shahram Tangestaninejad ◽  
Hamid Aliyan
Keyword(s):  
Aliphatic Alcohols ◽  
Solvent Free ◽  
New Method ◽  
Heteropoly Acids ◽  
Hydroxyl Groups ◽  
Secondary Alcohols ◽  
Highly Efficient ◽  
Keggin Type ◽  
Primary Hydroxyl ◽  
Solvent Free Reaction

Tosylation of some alcohols and phenols has been directly carried out with p-toluenesulfonyl chloride using heterodoxy acids (H3PW12O40, H3PMo12O40, AlPW12O40, and AlPMo12O40) as catalysts in the absence of solvent. We found that heteropoly acids AlPW12O40 and AlPMo12O40 were effective catalysts for the tosylation of alcohols and phenols. In the case of aliphatic alcohols, secondary alcohols undergo tosylation chemoselectively in the presence of primary hydroxyl groups. This new method consistently has the advantage of excellent yields and short reaction time.Key words: tosylation, p-TsCl, Keggin-type polyoxometalate, solvent-free reaction.

scholarly journals Pyrene Carboxylate Ligand Based Coordination Polymers for Microwave-Assisted Solvent-Free Cyanosilylation of Aldehydes

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1101
Author(s):  
Anirban Karmakar ◽  
Anup Paul ◽  
Elia Pantanetti Sabatini ◽  
M. Fátima C. Guedes da Silva ◽  
Armando J. L. Pombeiro
Keyword(s):  
Coordination Polymer ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Metal Ion ◽  
Solvent Free ◽  
Lewis Acidity ◽  
Carboxylate Ligand ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted

The new coordination polymers (CPs) [Zn(μ-1κO1:1κO2-L)(H2O)2]n·n(H2O) (1) and [Cd(μ4-1κO1O2:2κN:3,4κO3-L)(H2O)]n·n(H2O) (2) are reported, being prepared by the solvothermal reactions of 5-{(pyren-4-ylmethyl)amino}isophthalic acid (H2L) with Zn(NO3)2.6H2O or Cd(NO3)2.4H2O, respectively. They were synthesized in a basic ethanolic medium or a DMF:H2O mixture, respectively. These compounds were characterized by single-crystal X-ray diffraction, FTIR spectroscopy, thermogravimetric and elemental analysis. The single-crystal X-ray diffraction analysis revealed that compound 1 is a one dimensional linear coordination polymer, whereas 2 presents a two dimensional network. In both compounds, the coordinating ligand (L2−) is twisted due to the rotation of the pyrene ring around the CH2-NH bond. In compound 1, the Zn(II) metal ion has a tetrahedral geometry, whereas, in 2, the dinuclear [Cd2(COO)2] moiety acts as a secondary building unit and the Cd(II) ion possesses a distorted octahedral geometry. Recently, several CPs have been explored for the cyanosilylation reaction under conventional conditions, but microwave-assisted cyanosilylation of aldehydes catalyzed by CPs has not yet been well studied. Thus, we have tested the solvent-free microwave-assisted cyanosilylation reactions of different aldehydes, with trimethylsilyl cyanide, using our synthesized compounds, which behave as highly active heterogeneous catalysts. The coordination polymer 1 is more effective than 2, conceivably due to the higher Lewis acidity of the Zn(II) than the Cd(II) center and to a higher accessibility of the metal centers in the former framework. We have also checked the heterogeneity and recyclability of these coordination polymers, showing that they remain active at least after four recyclings.

Microwave-Assisted Efficient, One-Pot, Three-Component Synthesis of 3,5-Disubstituted 1,2,4-Oxadiazoles under Solvent-Free Conditions.

ChemInform ◽  
2006 ◽  
Vol 37 (32) ◽  
Author(s):  
Mehdi Adib ◽  
Amin Haghighat Jahromi ◽  
Narjes Tavoosi ◽  
Mohammad Mahdavi ◽  
Hamid Reza Bijanzadeh
Keyword(s):  
Solvent Free ◽  
One Pot ◽  
Microwave Assisted ◽  
Solvent Free Conditions

Solvent-free catalyst-free microwave-assisted acylation of lignin

2015 ◽  
Vol 65 ◽  
pp. 446-453 ◽  
Author(s):  
Fanny Monteil-Rivera ◽  
Louise Paquet
Keyword(s):  
Solvent Free ◽  
Microwave Assisted ◽  
Catalyst Free
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